What a clueless MC. With his trauma, he hasn't paid attention to anything related to female behaviour.
Worse, he's ignoring his spider-senses.
He's screwed.
The story is fundamentally flawed in my opinion.
Given their behaviour and boredom, they would have been discovered long ago and caused ripple effects in human history.
Glad I forgot about this and stopped reading.
Sad from the early chapters' potential.
Edit: Looking at the early chapters, it's easy to see where this ended up. Dozens of chapters with barely anything happening and the MC and his friend being pathetic.